G funding-mill



P ATENTED JAN. 26, 1904:.

A. J. ROBINSON.

GRINDING MILL. APPLICATION FILED MAR. 13 1903.

7 SHEETS-SHEET 1.

H0 KODEL.

Aflorney No. 750,701. PATENTBD JAN. 26. 1904. A. J. ROBINSON. GRINDINGMILL.

APPLIOATION FILED MAR. 13, 19 03. N0 MODEL. 7 SHEETS-SHEET 2.

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No. 750,701. PATENTED JAN. 26, 1904.

A. J. ROBINSON.

GRINDING MILL.

APPLICATION FILED MAR. 13, 1908. no MODEL. 7 SHEETS-SHEET z.

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No. 750,701. PATENTED JAN. 26, 1904. J. ROBINSON. GRINDING MILL.

APPLICATION FILED MAR. 13, 1903.

I0 IODEL. 7 SHEETS-SHEET 4.

WITNESSES: v [NVENTOR 1: NORRIS PETzns co. monxurua. WASHINGTON u c No.750.701. PATENTED JAN. 26, 1904.

A. J. ROBINSON. GRINDING MILL.

APPLICATION FILED MAR. 3, 0 NO KODEL.

7 SHEETSTSHEET 5.

No. 750,701. 'PATBNTED JAN. 26, 1904. Y

A. J. ROBINSON. GRINDING MILL.

APPL-IUATION FILED MAR. 13, 1903. N0 MODEL. 7 SHEETS-SHEET 6.

11' IM H W1 TNESS INVENTOR PATENTE-D JAN. 26, 1904.

7 SHEETS-SHEET 7.

N0 IODEL.

: -omus virus so Pnoroumo WASHIN Patented January 26, 1904.

UNITED STATES PATENT OFFICE.

AARON J. ROBINSON, OF FREMONT, NEW HAMPSHIRE.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent N0. 750,701, dated January26, 1904.

Application filed March 13, 1903.

To all whom, it may concern:

Be it known that I, AARON J. ROBINSON, a citizen of the United States,residing at Fremont, in the county of Rockingham and State of NewHampshire, have invented a certain new and useful Grinding-Hill, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

This invention relates to grinding-mills of the type employingoppositely-arranged grinding-disks mounted on the adjacent ends of thesections of a divided shaft and operating within a casing to which thematerial is fed through a feed-throat from a hopper, the casing,together with the other parts of the mill, being mounted upon a suitablebase.

In grinding-mills of the class above referred to great difliculty andinconvenience have been experienced in getting access to the interior ofthe casing and the grinding-disks for the purpose of renewing thehard-metal grinding-plates which are fastened to the opposing faces ofthe disks, it being necessary in mills of the ordinary construction nowin use to practically dismantle or take down the mill in order toperform the work above referred to. On account of the constructionheretofore employed it has also been a matter of considerable expenseand difficulty to renew parts of the mill, and especially the parts ofthe casing adjacent to the hubs of the grindingdisks. By the presentinvention duplicate parts can be furnished to replace those pieces whichare subject to wear, and such duplicate parts can be easily fitted inplace, restoring the casing and its attached parts to practically theiroriginal condition.

The object of this invention is to overcome the difficulties referredto, and for that purpose the casing, together with the main bearings,supporting-chairs, and yoke, and one section of the main shaft are soconstructed, arranged, and disposed with relation to each other that byremoving one portion only of the casing, together with a few bolts, theeasing may be opened up by swinging one section of the shaft and theparts immediately associated therewith, together with a portion of thecasing, to one side. This can be ac- Serial No. 147,637. (No model.)

complished in a few minutes, and then the faces of both of thegrinding-disks and parts connected therewith are fully exposed to theoperator, who may readily renew the grinding-plates. The construction ofthe casing and the parts contiguous thereto, together with the hubs ofthe grinding-disks, is such that those parts of the casing, disks, andhubs of the disks and also the parts of the feedthroat which are subjectto wear may be readily renewed or replaced by similar new parts, therebyavoiding the expense of an entire new casing. In this way the mill maybe kept in thorough working order for years at a trifling expense.

l/Vith the above and other objects in view, the nature of which willmore fully appear as the description proceeds, the invention con sistsin the novel construction, combination, and arrangement of parts, ashereinafter fully described, illustrated, and claimed.

In the accompanying drawings, Figure 1 is a side elevation of one halfor a grinding- Inill, and Fig. 2 is a similar View of the other half ofa grinding-mill, constructed in accordance with the present invention.Fig. 3 isa plan view of that half or portion of the mill shown in Fig. 1with the upper portion of the casing removed preparatory to swinging onesection of the shaft and the disk carried thereby to one side for givingaccess to the casing and disks, also showing by dotted lines theposition of the parts when swung to one side. Fig. 4 is a verticaltransverse section through the mill, taken on the line 4 4 of Fig. 3,the feed-throat also being partly broken away. Fig. 5 is a verticallongitudinal section taken through the casing and grinding-disks,feed-throat, &c., in line with the divided main shaft, the latter beingshown in ele- Fig. 6 is a horizontal section througlf 90 sectionsremoved. Fig. 10 is adetail perspective view of the sectionalcasing-ring which forms a permanent part of the casing. Fig. 11 is asimilar view of one of the removable sectional sleeves or collarsdetached from the casing. Fig. 12 is a detail perspective View of aportion of the feed-throat which forms a permanent part of the casing.Fig. 13 is a similar view of the removable upper and outer feed-throatsection. Fig. 142 is a detail perspective View of the upper and innerremovable feed-throat section and the removable lower feed-throatsection. Fig. 15 is a similar view of the grinding-disk ring.

Similar numerals of reference designate corresponding parts in all thefigures of the drawings.

In the complete machine illustrated in Figs. 1 and 2 one-half of themachine in each figure comprises a base or bed piece 1, acentrally-arranged casing 2 for the grindingdisks, and a maindisk-operating shaft which is divided about centrally within the casing2 and comprises sections 3 and 1, which are located exactly in alinementwith each other, but which operate simultaneously in oppositedirections, the sections 3 and 4: being for that purpose provided withpulleys 5 and 6, respectively, to which motion is imparted bydriving-belts from one or more counter-shafts located at convenientpoints.

Each of the shaft-sections 3 and 1 is journaled in bearings 7 supportedby means of chairs 9, interposed between the bearings and the base andbolted or otherwise secured, as at 10, to the base or bed piece 1. Thebearings 7 on each side of the grinding-disk casing are connected bymeans of yokes 11, which serve to keep the bearings in perfect alinementwith each other. It will be understood that two of said yokes 11 areemployed one at each side of the center of the machine and each yokecarrying at its opposite ends the bearings 7.

Mounted fast upon the inner ends of the shaft-sections 3 and 1 are thegrinding-disks 12 and 13, which rotate with the shaft-sections and turnin opposite directions, said disks having bolted to their opposing inneradjacent faces grinding-plates 14, between which the corn or other grainor material is ground. The hub of each grinding-disk has detachablyapplied thereto by means of screws or bolts 15 a removable hub-section16, said section 16 comprising that portion of the hub which is exposedto wear, as will hereinafter :appear, so that when worn out thehub-sections 16 may be removed and replaced by new ones without thenecessity of renewing the disks as a whole.

One of the grinding-disks is made solid throughout, while the othergrinding-disk is provided with a central opening 17, so as to allow thematerial from the hopper to pass from the feed-throat through said diskinto the grinding-space between the two disks, as illustrated in Fig. 5.

The upper portion of the casing 2 is in the form of a semicylindricalhood 18, the same being provided at its lower edge with lugs 19, havingopenings to receive bolts by means of which said hood is connected tosimilar lugs 20 on the lower portion of the casing. (See Fig. 9.) Thelower portion of the casing is also substantially semicylindrical inshape, but is divided longitudinally and provided along the meetingedges of the sections with twin flanges 21, provided at suitableintervals with holes 22 to receive bolts or other fasteners, wherebysaid sections of the lower portion of the casing are firmly boltedtogether. One of the lower sections (indicated at 23) is provided with abase-flange 2 1, which is permanently connected to the base or bed piece1 of the machine, said section being therefore stationary. The othersection, 25, is provided to one side of its meeting face with anoifstanding pivot-lug 26, the same being provided with an opening 27 toreceive a pivot bolt or screw 28, which passes through the lug down intoa boss 29, formed on the base or bed piece 1, as shown in Figs. 1 and 4.The section 25 is also provided with a base-flange 66, on the outer edgeof which are upwardly-projecting lugs or ears 30, which are bolted orotherwise securely connected to the lugs or ears 31, forming part of theadjacent chairs 9.

It will be observed that the shaft-section 4, the pulley 6 thereon, thegrinding-disk 13, the yoke 11, chairs 9, bearings 7, and adjacentsection 25 of the lower portion of the grindingcase are all connected toeach other and adapted to swing on the pivot 28 as a center. In order todo this, it is first necessary to remove the bolts 10, the bolts 32,which pass through the holes 22, above referred to, and also the bolts33, which connect the upper and lower portions of the casing in whichthe grindingdisks are located. The hood 18 is first .removed by takingout the bolts 33, and then, after removing the bolts 32 and 10, thesection 1 of the shaft, together with the parts connected therewith, andthe bearings, chairs, and yoke, together with the adjacent portion ofthe casing and grinding-disk, are swung laterally to one side from thefull-line position of Fig. 3 to the dotted-line position thereof. Thisgives access to the inner faces of the grinding-disks and enables thehard-metal grinding-plates to be removed from the disks proper and berepaired or replaced by new ones. In returningthe parts to their normalpositions the pivot 28 brings the disks into exact and proper workingrelation, thus doing away with the necessity of adjusting any of theparts of the machine. After replacing the bolts, screws, or otherfasteners employed the machine is again in readiness for use.

Arranged at one side of the casing 18 and secured thereto is a verticalfeed-spout 34, which extends from the hopper 35 downward and terminatesin a feed-throat leading to the space between the grinding-disks.Extending across and through the upper portion of the feed-spout 34 is afeeder-shaft 36, which carries the feeder by means of which the materialis conducted from the hopper into the feed-spout, 37 designating theoperating-handle of a feed-regulator for governing the amount ofmaterial fed into the machine. Upon the feeder-shaft 36 is mounted apulley 38, adapted to receive a driving-band from a small pulley 39 onone of the sections 3 of the divided main shaft of the machine, motionbeing transmitted in this way to the feeder.

The feed-spout 34 empties at its lower end into the feed-throat 40,which is of sectional construction, 41 designating the main body andextreme upper portion of the feed-throat and having an inclined andinwardly-converging outer wall 42, the lower edge 43 of which ismachined to a standard size. By machined I mean that said edge 43 isturned in the are of a true circle upon a lathe in order that thecontiguous part may fit properly against the same. The section 41 of thefeedthroat is illustrated in detail in Fig. 12, wherein it will beobserved that the upper portion of said section is left open, as shownat 44, to receive the feed-spout 34.

The feed-throat extends entirely around the hub of the adjacentgrinding-disk, as shown in Fig. 5, and comprises several parts in theform of removable sectional sleeves or collars, two extending over andabove the hub of the grinding-disk and one beneath said hub. 45designates the removable lower feed-throat section, which encircles thelower half of the hub of the adjacent grinding-disk, the same beinghollowed out, as shown at 46, to allow the material to pass around thehub of the disk and through the opening 17 into the grindingspace. 47designates the removable upper and outer feed-throat section, whichextends over and half-way surrounds the hub of the disk and is pitchedat the same inclination as the wall 42 of the section 41 of thefeed-throat, the section 47 being rabbeted, as shown at 48, and alsomachined at 49 to receive the machined edge 43 of the section 41, thussecuring an accurate fit of said parts whenever it is necessary to renewpart 47, which may be done without the necessity of renewing the part41.

50 designates the upper and inner feedthroat section, which, likesection 47 extends over the upper half of the hub of the adjacent disk,as shown in Fig. 5. The section 50 forms the inner inclined wall of thefeedthroat and is provided at its upper edge with a circumferentialflange 51, which is provided with openings 52 to receive bolts or screws53, by means of which it is connected to a casing-ring 54, bolted orotherwise permanently connected to one side of the casing, as shown inFig. 5. The outer edge 55 of the section 50 is machined to fit thecorresponding machined face 56 of the casing-ring 54, the said ringbeing provided with an inwardly-extending annular flange 57 as shown inFigs. 5 and 10, the inner surface of which is machined, as above stated.The upper and inner feedthroat section 50 is also provided at its inneredge with a horizontally-projecting flange 58, which is also turned ormachined on its outer side, so as to form an accurate fit with the innermachined edge of adisk-ring 59, (shown in detail in Fig. 15,) the samebeing bolted or otherwise detachably secured to the outer side of thedisk next to the feed-throat and provided with an exteriorly-machinedinwardlyprojecting annular flange 60, which fits within the opening 17of the adjacent grinding-disk.

From the foregoing it will be understood that that portion of thefeed-throat which extends immediately around the hub adjacent to thegrinding-disk is composed of three pieces, a single piece 45 extendingaround and embracing the lower half of the hub and two pieces 47 and 50extending around and embracing the upper half of the hub and meetingwith the lower piece or section 45.

At the opposite side of the casing there is arranged another casing-ring61, similar in all respects to that, 54, hereinabove described andforming the attaching means for a sleeve or bushing 62, which extendsaround the hub of the remaining disk and is provided with acircumferential flange 63, the outer edge 64 of which is machined to fitagainst the machined face 56 of the casing-ring, the flange 63 beingalso provided with openings to receive bolts, screws, or other fasteners65.

When wear takes place in the bearings 7 the hubs of the grinding-diskswear at their lower sides against the parts 45 and 63, and when thewear, which is largely contributed to by grit or dirt on the materialbeing ground, amounts to considerable said parts, together with thebearings, must necessarily be renewed. As the sections 3 and 4 movedownward the disk ring 59 also wears against the flange 58 of the innerand upper feedthroat section, thus necessitating compensation for wearat that point. Wear also comes upon the removable hub-sections 16.Heretofore the wearing away of such parts of the casing and mechanismhas involved considerable expense in restoring the mill to good workingcondition, so as to prevent the escape of material therefrom. By meansof the invention hereinabove described, however, the parts 45, 47, 50,59, 62, and 16 may be easily detached and replaced by duplicate newparts, and said parts fit accurately in place, the said parts beinginterchangeable, so as to fit any mill, no matter how much the same maybe worn. Furthermore, renewable parts of the mill may be shipped fromthe factory to the user, thereby avoiding the necessity of shipping themill as a whole to the factory for repair, any good mechanic being ableto replace the parts which have become worn out. In this way the life ofthe mill may be indefinitely extended.

Having thus described the invention, what I claim as new, and desire tosecure by Letters Patent, is

1. A grinding-mill comprising a divided main shaft, grinding-disksthereon rotating in opposition to each other, a supporting-base, acasing inclosing the grinding-disks and embodying a removablesemicylindrical hood, longitudinallydivided separable lower sections oneof which is stationary and the other pivotally connected to the base soas to swing horizontally, and a bearing-yoke for one of theshaft-sections rigidly connected with the pivoted section of the casingand adapted to swing therewith.

2. A grinding-mill comprising a divided main shaft, grinding-disksthereon rotating in opposition to each other, removable grindingplatessecured to said disks,a supporting-base, a casing inclosing thegrinding-disks and embodying a removable semicylindrical hood,longitudinally-separable lower sections, one of which is stationary andthe other pivotally connected to the base so as to swing horizontally,and yoke-connected bearings for one of the shaft-sections rigidlyconnected with the divided section of the casing and adapted to swingtherewith.

3. A grinding-mill comprising a divided main shaft, grinding-disksthereon rotating in opposition to each other, a supporting-base, acasing inclosing the grinding-disks and embodying a removablesemicylindrical hood, longitudinal separable lower sections, one ofwhich is stationary and the other pivotally connected to the base so asto swing horizontally, yoke-connected bearings for one of theshaft-sections, rigidly connected with the pivoted section of the casingand adapted to swing therewith, and means for securing the pivoted andhorizontally-swinging section of the casing to the base and to thestationary section.

4. A grinding-mill comprising a divided main shaft, grinding-disksthereon rotating in opposition to each other, a supportingbase, a casinginclosing the grinding-disks and embodying a removable semicylindricalhood, longitudinally-separable lower sections one of which is stationaryand the other pivotally connected to the base so as to swinghorizontally, and yoke-connected bearings for one of the shaft-sectionsrigidly connected with the pivoted section of the casing and adapted toswing therewith, the pivoted section of the casing being provided withan offstanding pivot-lug to one side of its inner abutting surface.

5. A grinding-mill comprising a divided main shaft, grinding-disksthereon rotating in opposition to each other, asupporting-base, a casinginclosing the grinding-disks and embodying a removable semicylindricalhood, and a longitudinally-divided semicylindrical lower portion, thedivided portions of which are relatively movable toward and away fromeach other, sectional casing-rings secured to opposite sides of thecasing, and sectional collars detachably secured to said rings andextending around the hub portions of the disks, one of said collarsforming a portion of the feed-throat leading to the grinding-space.

6. A grinding-mill comprising a divided main shaft, grinding-disksthereon rotating in opposition to each other, a supporting-base, acasing inclosing the grinding-disks and embodying a removablesemicylindrical hood, and a longitudinally-divided semicylindrical lowerportion, the sections of which are relatively movable one toward andaway from the other, sectional casing-rings permanently secured toopposite sides of the casing, sectional sleeves or collars removablysecured to said rings and extending around the hub portions of thedisks, one of said sleeves or collars forming a portion of thefeed-throat leading to the grinding-space, a feed-throatarranged at oneside of the casing, and removable upper, outer and lower feed-throatsections secured thereto and extending around the hub of one of thedisks, substantially as described.

7. A grinding-mill comprising a divided main shaft, grinding-disksthereon rotating in opposition to each other, a supporting-base, acasing inclosing the grinding-disks and embodying a removablesemicylindrical hood, and a longitudinally-divided semicylindrical lowerportion, the sections of which are relatively movable one toward andaway from the other, sectional casing-rings permanently secured toopposite sides of the casing, sectional sleeves or collars removablysecured to said rings and extending around the hub portions of thedisks, one of said sleeves or collars forming a portion of thefeed-throat leading to the grinding-space, a feed-throat arranged at oneside of the casing, removable inner and outer feed-throat sectionsremovably secured thereto and extending over the hub of one of thedisks, and a lower feed-throat section removably secured thereto andextending beneath said hub with the upper feed-throat sections restingthereon, substantially as described.

8. A grinding-mill comprising a divided main shaft, grinding-disksthereon rotating in opposition to each other, a supporting-base, acasing inclosing the grinding-disks and embodying a removablesemicylindrical hood,

and a longitudinally-divided semicylindrical within said sleeves orcollars, substantially as 1 lower portion, the sections of which arereladescribed.

tively movable one toward and away from the In testimony whereof I aflixmy signature in other, sectional casi1ng-rin%s permanently sei presenceof two witnesses.

cured to opposite sic es of t e casing, sectiona sleeves or collarsremovably secured to said AARON ROBINSON rings and extending around thehubs of the Witnesses:

disks, and hub-sections detachably connected L. H. GOTWALD,

with the hubs of the grinding-disks and lying REXFORD M. SMITH.

